The Metropol Parasol, located in Seville, Spain, just opened its doors to the public and is the world's largest wooden structure. Some pragmatically-minded city planners originally wanted to build a parking garage on the site, then they discovered some artifacts of archaeological significance and opted to build a museum/shopping center instead.

From the looks of it, the roof is the best part—you can actually go up there and check out views of the entire city. [Design Boom via Inhabitat]